Protoliths and phase petrology of whiteschists [PDF]
Contributions to Mineralogy and Petrology, 2013 Whiteschists appear in numerous high- and ultrahigh-pressure rock suites and are characterized by the mineral assemblage kyanite + talc (+-quartz or coesite). We demonstrate that whiteschist mineral assemblages are well stable up to pressures of more than 4 GPa but may already form at pressures of 0.5 GPa.
Franz, Leander +2 more
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A Protolith Reconstruction Model (PRM) for Metabasalt: Quantitative Protolith and Mass Transfer Estimation Based on Machine-learning Approach [PDF]
, 2021 Abstract Mass transfer in rocks provides a direct record of fluid–rock interaction within the Earth, including metamorphism, metasomatism, and hydrothermal alteration. However, mass transfer analyses are usually limited to local reaction zones where the protoliths are evident in outcrops (1–100 m in scale), from which regional mass transfer can
Satoshi Matsuno +3 more
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Large Igneous Provinces (LIPs) and Anoxia Events in “The Boring Billion”
Geophysical Monograph Series, Page 449-486., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Shuan‐Hong Zhang +4 more
wiley +1 more source
Chemical identification of metamorphic protoliths using machine learning methods [PDF]
Computers & Geosciences, 2019 Abstract The fundamental origins of metamorphic rocks as sedimentary or igneous are integral to the proper interpretation of a terrane’s tectonic and geodynamic evolution. In some cases, the protolith class cannot be determined from field relationships, texture, and/or compositional layering.
Derrick Hasterok +3 more
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JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2020 At Selo Gajah Hill, Jari Village, Gondang Sub-district, Bojonegoro Regency, East Java there are limestone intruded by porphyritic andesite. The intrusion produces contact metamorphisms in the wall rocks.
Tri Winarno +2 more
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Geologica Carpathica, 2016 The Alpine nappe stack in the Penninic-Austroalpine boundary zone in the Rätikon (Austria) contains a 4×1 km tectonic sliver of meta-diorite, known as the Schwarzhorn Amphibolite.
Nilius Nils-Peter +4 more
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PETROLOGY AND GEOCHEMISTRY OF BASEMENT GNEISSIC ROCKS AROUND OKA-AKOKO, SOUTHWESTERN, NIGERIA [PDF]
Malaysian Journal of Geosciences, 2018 The gneissic rocks of Oka-Akoko area forms part of the Migmatite-Gneiss-Quartzite Complex of the Southwestern Nigerian Basement Complex. The petrologic units in the study area include grey gneiss, granite gneiss, Older granite, charnockite and minor ...
Adegbuyi, O., +2 more
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U-Pb zircon dating of basement inliers within the Moine Supergroup, Scottish Caledonides: implications of Archaean protolith ages. [PDF]
, 2008 Basement gneiss inliers within the Scottish Caledonides have been conventionally correlated with the Archaean Lewisian Gneiss Complex of the Caledonian foreland.
R. Strachan (23330386) +2 more
core +2 more sources
Characteristics of Ore Protolith in Bronze Age Metallurgy of Steppe Cis-Urals
Археология евразийских степей, 2022 The paper addresses the issues of determining the probable sources of copper raw materials in the Bronze Age metal production of the 4th–2nd Millennia BC in the territory of the steppe Cis-Urals.
Sergei V. Bogdanov
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Литосфера, 2016 The paper presents geochemical and isotopic characteristics of gneyss-granite of the Chechek dome structure that located in Irtysh Shear Zone. It shows that all “granitoid” of Chechek structure have a similar composition.
I. A. Savinskiy
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